Form a pair of linear equations for the following problems and find their solution by substitution method.
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Solve and and hence find the value of 'm' for which .
Solve the following pair of linear equations by the substitution method.
Draw the graphs of the equations x-y+1=0 and 3x+2y-12=0. Determine the coordinates of the vertices of the triangle formed by these lines and the x-axis, and shade the triangular region.
Given the linear equation (2x+3y-8=0), write another linear equation in two variables such that the geometrical representation of the pair so formed is: